Finding the Third Proportional to 434,622 and 639,355.50

Step by Step Solution

1. Step 1: Write the proportion equation
   434,622 : 639,355.50 = 639,355.50 : x
2. Step 2: Convert to fraction form
   434,622/639,355.50 = 639,355.50/x
3. Step 3: Cross multiply
   434,622x = 639,355.50 × 639,355.50
4. Step 4: Simplify right side
   434,622x = 408,775,455,380.25
5. Step 5: Solve for x
   x = 408,775,455,380.25/434,622
6. Step 6: Final answer
   x = 940,530.98